If you want a nice, even more twisty and fun road....
Try the run down the A5 from North Wales, into Newtown and through the mountains to Builth Wells. Particularly Newtown to Builth. I don't know the road number off the top of my head, but its basically a very long run of bends and corners with very little straight bits.
Fantastic fun, but very hard on the tyres. I have frightening pics to prove

When compared to my daily route (Corwen>Llandegla>liverpool) this is a fun road.

Dragon